Effect of Microstructure on Wear of WC/Ni PTA Coatings

Abstract

WC-Ni coatings were deposited onto steel substrates by the plasma transferred arc (PTA) weld-surfacing process. The wear performance has been evaluated by abrasion wear tests. The deposits were subsequently characterized using optical microscopy, scanning electron microscopy (SEM), and hardness testing. The microstructure consists of two kinds of carbide particles dispersed into the Ni-base alloy matrix. The analysis of the wear surfaces shows that the main wear mechanisms were preferential removal of one of the carbides by binder erosion and microcracking of the other. A variety of analyses were carried out to try to find a correlation with the wear test results. It is concluded that macro hardness, porosity, and the mean free distance between tungsten carbides are the main factors that correlate to the wear performance.

Meeting Name

International Surface Engineering 1st Congress (2002: Oct. 7-10, Columbus, OH)

Department(s)

Materials Science and Engineering

Keywords and Phrases

Binder Erosion; Ni-Based Alloys; Plasma Transferred arc (PTA) Coatings; Wear Mechanism; Abrasion; Binders; Hardness Testing; Microstructure; Nickel; Nickel Alloys; Optical Microscopy; Plasma Welding; Porosity; Scanning Electron Microscopy; Tungsten Carbide; Wear of Materials; Wear Resistance; Hard Facing; Ni-Base Alloy; PTA Coatings; Tungsten Carbides; Wear Mechanism; Wear Resistance

International Standard Book Number (ISBN)

978-0-87170-781-9

Document Type

Article - Conference proceedings

Document Version

Citation

File Type

text

Language(s)

English

Rights

© 2003 ASM International, All rights reserved.

Publication Date

01 Oct 2003

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